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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9f1b3335407a024996a622298280d7f957c5e05e50dca5921fa363403a376a' 
  AND token = '5OiBrqcOBEsgMkUkia1qo/w9jQZSBXhWX/Qrg0am80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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