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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfaba7e22d510aecdaee3801e1c0b58e07d70fdcb384b1ecc2c3c6c07a5d5b2' 
  AND token = 'yGyFtQwiQ27CAJoMzPx7VM16FtJym+JprsAr5YlrmHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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