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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da426bcf0be2d52533a8d5906c7a71031c45ac9fdda2e74b2f1f24e5d3f4b7a' 
  AND token = '2l483OciSUFlUEyVAdk8xurlRcwePHfE3fYwC0ZxCP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}