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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94583a5c775d33cb0da8616899d57d8cb08e8b84c3b4a8c4e07cc3dd8944822' 
  AND token = 'UZPm8Fa3NNAKZqQU4r0cEBKGq1ekg7YfPzjhmx1fImk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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