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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3577d39792729beb2d66ed7b1fa9c36d42a9a7abe8b5afb91819e2a80106418a' 
  AND token = 'J1FE/hfzI2nupPIkSMqnu/WpK73XbXkq2zHIz9xEls4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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