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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9ab05d05b364b256838ace35243542f2eb86412ffa26f8ffa7e354c5e511b3' 
  AND token = 'oS61tn/8tMJvmZn7sduedTCF1mTqv9e88E62JYsVgpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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