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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fdd39ab97d3f554d1919095a9ebc7ef94c3e0b4bd97701b433d62bcb845c39' 
  AND token = 'yble1AWK70DfWPvC2X6AihWjN7Y6uIvx7wOhQUyoMKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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