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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b247477b882b7f614dd56f0777a6faa623cad58bd2fad67c94b7873d359c19da' 
  AND token = 'U26ejfZiU17o/klVi00nK+lnng9N4SUQVCHJV1PPjh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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