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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ec782a956c0c5bac8a744ed008994b14535be87bf74db0c45b6df09a4f043f' 
  AND token = 'HiV9Gbq2zKc0yv2TlpMW5M5fUXT4y6QnkVo7M42mHOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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