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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb11fba8bfd6ab74f2ca406c723af72c98a1fe881fe1559161ed8ab6f2ab90f6' 
  AND token = 'E/g+U5yrp/NInw7zNa1JQOnaV+TrYEt7BJm2nUcwI6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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