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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c857def9523f0db87e7b2e2f3e39f69a349d4c41d05a57685beecc5dd93f7f69' 
  AND token = '5faRAX/IIsb8gaKa56veBkrgF3pQ9jBkUOjyeMXxazw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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