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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aad8a8c4a1f8dd4f3f0d77bdcf9e100aeecb9274b421ef403d9d515c8a15d4f' 
  AND token = 'hF3wKmVBTWX4PruT9oyiH2Gj0alOiWpO4xG7jQIQjdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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