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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a342b064a2ccf6046e4fdd0a57f4bff37de91d210988285ac509620283a2a81' 
  AND token = 'JfyrXFCQPiut9hmSguiMaM7yIu9o2kazSJeXkEKq0YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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