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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fa4d234f3d409981b18dc9127ec5733cbba236a9738a3182b8bf8b4aeff84f' 
  AND token = 'seFrFEfD6QOFSzJALOakNTY6OnWfOCjL6cx0Q5VLsPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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