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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab89f577da89ca3087d265b63191c0b31019e7deff3ad04de9bb04388af716cd' 
  AND token = 'jAtYha/EiIzfjbZ7Yf5RZ9ukbeIBDQT85kYCu/lsfIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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