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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc98222a05922ec18738e235f2965ed18b6fa1482b788dc056f5bd2d63a5c3e' 
  AND token = 'tHTyr5J2EpAe7sS7S3dxZ13W3glhGzotpo/3I4C7ta0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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