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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341da5c9a6dd154e1f64d919419859352718e56ef4e7cd7d3d65f508f43e81ee' 
  AND token = 'mPiw93M5dyEIXR/dXDjD07Ma6ah3rZz4oKOswMR6aHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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