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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9002aa917d328bd4c1b78b4adabc061f161c768ecdbb58c545d9efcddce2b2c' 
  AND token = '8tvZ+va9w/iwohAevS6wurIRhbKVNdvoKLaq80eDIzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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