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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698f245efb9eb19c970d4b40d5b70a0b26da6ff5406089df5cb82a9a8b91186a' 
  AND token = 'i7g8lnTPzaSbcX7VtRaHofJXBWIa4mzDI24pwBGecnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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