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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7775f10edae985fe9da33d95c0b94598601e360ddc0e31e774f28b87cdd2ff34' 
  AND token = '1xcWgkeSR/jwuE29NSx+nrwHfL8514ZxgqoSBPgMk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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