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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26f7b212a2b73d82e752d1a5c2a8bfac2441ad26cd410c1cfd64c819f87e6d6' 
  AND token = 'qWoTN0Z582zk5RSKt9MBt8ZlnqE7ZA5dJNVrZTYWSZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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