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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb6f2d449738afb256c6289c6a028693bb62bfd5f6bb55f713d4b3cdf7efbcf' 
  AND token = 'Xg2UjpjywfOM51pKeY7hfAAlri/ori2uDvvOp1q7Na4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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