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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbbb3fa387bbfd88a22f766705b92cb5514fac1b9a68d8a7c6ebabac006f486' 
  AND token = 'WX0d6PR8irHE9PXZa8fWfsoIGHElfWDMLgOlqkatSL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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