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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9941f1ec02999eaf780f5718da7a89b8085b3631c550eec986bd806d394dda88' 
  AND token = 'myBnjeDFA0HUAYvNs0UpnfGF9r13vvRQXDIRj2Vko1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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