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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2926fcf2c431f59e7372ea02b69f107c055006467fd4efbd0de636af1ff56fdf' 
  AND token = '6sdMnsdsG/Tgs7Z8SC7lCUyy7w6uRTrzKL2Ekpeb7tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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