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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191eebdd9e924d96ca19325e6f7e357d084d5772a279fed6a6d0f195eb71aafa' 
  AND token = 'oK90n5X8h5Xg3DBdFAu6rgNl095sp4RQT2Jvdl7jsY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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