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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e3d82bc4bb9b58433a2c9d143f72bd3f6c4f4b21a15f1a6d593db4835c4e77' 
  AND token = 'dlckvM8cARBFeZ0ZVo1U+04RzA/0mcmXBU09IUOcq4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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