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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6636c4bb59d4be1194e9c7499a2530f2d15f1da7e53914462858cb62bf27d3ef' 
  AND token = 'k2gu3smaK7oVY8zsF5qs+WCirWuW6eDJ4jde9UDyCC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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