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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f3b0e386354ac8e28b89a5342a54a5bd784e848875211ee8a5fb882158abe7' 
  AND token = 'q2ZVHGPNED+K7fFW7jVq4Jb7rTVd1NPXspZhRrRv08w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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