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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6eafc3ebc2c110d93dc7f10df93c8ff32bb33ecdc5632fced2cbc419f3f4a0' 
  AND token = 'PJZB32Pks5O0wpGtPRWeEcM8+sbux+b1ZOEi9QP5pI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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