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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48f2c699d5896e4d6eccb29f508eeadcbb19a101cc9d6725a490acc952de62b' 
  AND token = 'XcCUKeigwtdWyHA3TXjinRQa2mdeiG4DdqN3fSWZiww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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