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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c99fbfa41a7807458a205a00a85817662d0e3ed7bfd8d2b083b0cb1a85497aa' 
  AND token = 'Kybhm5fSWT8xEfZKSTcrg7cCvghewNK6jYLsQaA+o7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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