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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be28a1356eb78da42d3466397e110a48badb2eb1eeae23037150a92b236ce1a' 
  AND token = 'm9uZ78pN+VwgGJQqsCQvmpF4L6heoCLUU+J+4r/ilow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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