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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2709c6ce2afdc81f66dc9b8cf81e904124796b08da8f1c7ba39b3965a13e1ef2' 
  AND token = '0b9Uxvm4tr7+p4IitDdxW1yVdm7ETg7+hFktV9c4hnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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