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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abc0b817bd886a20df4d70b88c0fd57b0dcf746f5fbbcba0694bee566e1ccd8' 
  AND token = '3KhDsG4zd6iJKvVj0xZcJNYo02CihmE3tMJSgbvAa5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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