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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896d9cb8ebe7b1b3b20977e2709ac03922da89758606921b024bc7cdd20b06cf' 
  AND token = 'TG7IeOFaw4urx7oygHGSL5Xh2kUt3qHpHLm3t5OJgMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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