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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89a1583e87ce88d08da4142793c7a25c860f2983af99b05a93725150e068145' 
  AND token = 'JinMEI/D1PLZJBmwa9TAZDoVdNZplU/c5uZyLD5Xbm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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