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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1e5811295b2ad1967013d6a15871d4b0da26874d0157027bd093535485b301' 
  AND token = '/mkMbFWFQ7a7K4KjIvkyW0bkdUfAgDAF8iE7972XrgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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