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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f897dd89ed3f450f181d86e8a6b31e30419a6cd65c25cb9cf0f3b03e559ad29' 
  AND token = '89FLLPFrLOPTrX8EsP/2k0kNjmS4ZD143nWdfeh18PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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