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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0ac36f09049d4902cbd35f686fe444c53b59de4a0e7d547d20043ac9a65c1b' 
  AND token = '2yMuEdD7yxU6sd5UumyywMuhfjDdKxY4i+nrVVnBptE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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