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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9e6cc9219bd3a9bf41693b9a7264f7403b8a18b04ee5556ff14cb0129602bc' 
  AND token = '9VgrmSXsf/5Io++kcKSXZ7uRJ/6jv4oZB4avZKdiMc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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