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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc650a2e186a565ab8126d34802f734c6a3a96023781b2804970218d3d2bc9e' 
  AND token = '4i+Hwy6/IZbsbIE8gpxbMpqshkQefnpNY2G7wi2kdug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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