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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688c60e0d9918fb0671ed71ce15a6e5928194ccaa1ee9ba131f84a6e8d99e5fa' 
  AND token = 'YHkmNOuODL3+uDvhaw+WX99YCr/KBQ94mNtbRcOJJyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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