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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aad6dd42fdb7307d30798f1b5fcec3895d0457c62a72fc5531b210be5c711e0' 
  AND token = 'u/a3p5mFKOwgzYrVJ12dxkjoIiwNsrLtgFJTdXym4MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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