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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1248f86b68eb471cc53174580ffc2c33dedf6ec7289084931b2945f9ce9b4d19' 
  AND token = 'ZKNBfQlv7Zv9q/jkFEBzU9wokdDQ2T75lNITeI48FMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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