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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4d79affc57cee09cc62db50c09d340ad77d36b6c2099b0796fa54f3079e77b' 
  AND token = 'dnU4veU4oujcvOYSVfiQJ5TS+wajSmKApI7KctNiCgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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