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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86a6dc31ae3aa948e86672d9dba6cd7e1e3f3888caaf3cce3c84f4bcd47b4ac' 
  AND token = 'm9ULaMklMLqCYwbCgvtotePN6cqpUb5bHLJSi3Yu6yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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