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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5bf263b5aed6a517b954d721e56156647dfe8d1c8c9ea66b5b61b606156a55' 
  AND token = 'i/qS7r5CEl+zp22MV2a3ryOKhrSk1FFTR9p39uqrzmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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