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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95eda339983c6841c1131d03f1264bc6febf6ea1990e19756d9e61ced704f068' 
  AND token = 'ExKYU8MHRXSUNeuFzKCExCRrAHF1PbdJOgHYer2Z0BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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