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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395b7c3e0ff5939e6d10834747aecacb0006ffe64a482ae9a01ea06ae53dc63a' 
  AND token = 'rm40s6IxBzmdu5dcYcebfSxj3KU/9+8jH3CbO8RQ1RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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