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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32187d2e2ac74a40e7f1c17caa4e855511d77bc1ceb0823a8f5f723d7e4dbae3' 
  AND token = 'wdTQdmjDu8TekeYsVEtTqNxhp7PieEPJV10iI8l5a9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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